Release Name: 0.4.2

Notes:
This is a bugfix release for the stable branch.


Changes:
* BooleanField#toSql handles '1'/'0' enum properly
* fixed bug with Query with a limit
* fixed bug where ObjectStore#getMax( domain_class ) failed with a domain
  class with a non-standard pk
* fixed bug where SqlValueConverter wasn't converting over a field if it had
  a non-default dbFieldName
* fixed bug with lafcadio_schema and BlobFields